I know this is kinda a dead thread but I use a Flipside 300 Lowepro. It can hold a Canon XTi with 50mm f/1.4 or 1.8 on it with a 70-300mm and a Speedlite 430EX II. On top of that I can fit my macbook in it, too. I can carry the kit lens or I can throw in my other speedlite and the transmitter to use for off camera. It works really well for what I do.